find the atomic spacing in a crystal of rock salt (nacl), whose structure is shown in fig. 2.19. the density of rock salt is 2.16 x 10° kg/m and the average masses of the na and cl atoms are respectively 3.82 x 10 26 kg and 5.89 x 10-26 kg

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.